Vote Clock

Early voting locations in Castro Valley, California for November 3, 2026

Map of California with Alameda County, home to Castro Valley, highlighted
Alameda County, California, home to Castro Valley. Map: U.S. Census Bureau boundaries.

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Castro Valley addresses are in Alameda County. Alameda County lists 101 early voting sites; 4 of them are in Castro Valley and listed here.

From the California Secretary of State's official list, checked October 14, 2026. Hours can change, so check before you go.

Castro Valley early voting sites (4)

Every early voting site in Alameda County (101) is on the Alameda County early voting page, with a ZIP code finder.

Castro Valley Election Day vote centers (4)

Tuesday, November 3. Polls close at 8 p.m.; if you are in line by 8 p.m., you can vote.

All 101 Alameda County Election Day vote centers are on the Alameda County page.

Alameda County elections office

Alameda County Elections Office

Office: 1225 Fallon Street, Room G-1, Oakland, CA 94612

Phone: 510-272-6933

Regular office hours: 8:30 a.m. to 5 p.m.

Directions

California voting dates for Castro Valley voters

DateWhat
Mon, Oct 5 EndedBallots go out to all voters source
Mon, Oct 5 StartedEarly voting opens source
Mon, Oct 19Last day to register source
Tue, Oct 27Last day to request a replacement ballot by mail source
Tue, Nov 3, 8:00 PMElection Day: polls open 7:00 a.m. to 8:00 p.m. source
Tue, Nov 3, 8:00 PMRegister and vote the same day source
Tue, Nov 3, 8:00 PMReturn your ballot source

Castro Valley voting questions

Where can I vote early in Castro Valley?

At the 4 early voting sites in Castro Valley on this page, from each county's official list. Alameda County lists 101 sites in all; see the Alameda County early voting page.

When does early voting start in Castro Valley?

Early voting in Castro Valley (Alameda County) started Monday, October 5, 2026 at the first sites to open. Some sites open later; each site's days are on this page.

When does early voting end in Castro Valley?

The last day of early voting in Castro Valley (Alameda County) is Monday, November 2, 2026. Election Day is Tuesday, November 3.

What are the early voting hours in Castro Valley?

Hours differ by site and day. The most common hours are 9:00AM-5:00PM. Check the site you plan to use before you go.

Where do I vote on Election Day in Castro Valley?

In this Voter's Choice Act county you can vote at any vote center in the county. Alameda County lists 101 Election Day vote centers on the Alameda County page. Tuesday, November 3. Polls close at 8 p.m.; if you are in line by 8 p.m., you can vote.

Who can vote early in Castro Valley?

Any registered voter in Castro Valley (Alameda County). In California you can vote at any early voting location in your county (vote centers in Voter’s Choice Act counties). Same-day voter registration is offered where marked.

What is the phone number of the election office for Castro Valley?

510-272-6933, the Alameda County Elections Office, 1225 Fallon Street, Room G-1, Oakland, CA 94612.

Which county runs elections in Castro Valley?

Alameda County. Castro Valley voters register and vote with Alameda County.

More for Castro Valley voters

Other cities and towns in Alameda County: Oakland, Fremont, Hayward, Berkeley, Alameda, Albany, Dublin, Emeryville, Livermore, Newark, Piedmont, Pleasanton, San Leandro, San Lorenzo, Union City.

Sites, days and hours are Alameda County's own, copied from its official list (named above); office details are from the California Secretary of State, County Elections Offices (checked October 14, 2026). Dates are California's, each linked to its source. Call the office before you go.